CN201221929Y

CN201221929Y - Band tape with brake

Info

Publication number: CN201221929Y
Application number: CNU2008200872679U
Authority: CN
Inventors: 吴其联; 黄忠华
Original assignee: Individual
Current assignee: NINGBO JUFENG TOOL INDUSTRIAL CO LTD
Priority date: 2008-05-19
Filing date: 2008-05-19
Publication date: 2009-04-15
Anticipated expiration: 2018-05-19

Abstract

The utility model discloses a tapeline with a brake, which comprises a shell, wherein, a tapeline core disc that is arranged inside the shell in a rotation way, and the tapeline core disc is provided with a tapeline belt, and the tapeline core disc is connected with an unreel power mechanism and a rotation brake, and the rotation brake at least comprises a brake mechanism, a potential energy mechanism, a brake operation mechanism, and a connection mechanism, wherein, the brake mechanism is used to brake the tapeline core disc; the potential energy mechanism always applies the potential energy to the brake mechanism in the braking direction; the brake operation mechanism can relief the brake from the outer side of the shell, and the connection mechanism connects the brake mechanism and the brake operation mechanism; the brake mechanism comprises a wedging fixed part and a blocking part, wherein, the wedging fixed part is fixed between the tapeline core disc and the blocking part in the unreeling rotation direction of the tapeline core disc, so as to brake the tapeline core disc. The one-way wedging-fixed-type bracket that is arranged inside the shell realizes the automatic locking brake of the tapeline core disc, thereby avoiding the problems that the ratchet-type brake has loud noise and large resistant force.

Description

Tape measure with brake

Technical Field

The utility model relates to a tape measure with stopper, this stopper mechanism can realize the braking of the automatic one-way locking of chi core dish.

Background

Conventionally, a tape brake provided in a tape measure is often operated to stop a tape at a position where the tape is pulled out by pulling out the tape from a case. The tape brake also employs an automatic locking system in which the tape is automatically stopped at a position where the tape is pulled out of the housing. This automatic locking means has a form in which the blade is stopped by braking the blade disc to which potential energy is given in the reel-back direction of the blade; alternatively, the tape is stopped by directly braking the tape extending from the core disc by a stop. The latter method has rapid braking, but has great damage to the tape printing surface and very strong impact when the tape stops; in the prior art, the ruler core disc is unidirectionally braked by the pawl, the corresponding ratchet needs to be arranged on the ruler core disc by adopting the method, the damage to the ruler core disc is large during braking, the impact is strong when the ruler belt stops, the occlusion noise of the pawl and the ratchet is large during the drawing-out process of the ruler belt, and meanwhile, the ruler belt has large resistance during drawing-out.

Disclosure of Invention

The utility model aims at providing a tape measure with stopper realizes the automatic locking braking to the chi core dish through setting up one-way wedge solid formula stopper in the casing, and in the chi area pull-out process, the stopper is automatic to be released for chi area pulling and chi core dish rotate can not receive the resistance from the stopper, and when the chi area had the tendency of rewinding, stopper automatic braking made chi core dish can't rotate the chi area of rewinding, when will withdrawing the chi area, manual release stopper makes chi core dish can rotate the chi area of rewinding. The wedge-fixed braking can avoid the problems of high noise, high resistance and the like of pawl braking.

The utility model discloses a following technical scheme can realize:

the utility model provides a tape measure with stopper, includes the casing, and the casing internal rotation sets up the core disc, and it has the chi area to wind on the core disc, core disc is connected with rewind power unit and rotation brake, rotation brake includes at least:

a brake mechanism for applying a brake to the core disc;

a potential energy mechanism which always gives potential energy to the braking mechanism towards the braking direction;

a brake operating mechanism operable from outside the housing to release the brake;

a connecting mechanism connecting the brake mechanism and the brake operating mechanism; wherein,

the braking mechanism comprises a wedge fixing part and a clamping part, and the wedge fixing part is wedged and fixed between the ruler core disc and the clamping part in the rewinding rotation direction of the ruler core disc to brake the ruler core disc.

The present invention will be described in detail below, in which the case is a member for housing a measuring tape, and is also a main body of the tape measure, the case is made of a resin material formed into a desired shape, a tape core shaft is vertically provided on a side wall in the case, a tape core plate is hinged to the tape core shaft, and the measuring tape printed with scales is wound around the tape core plate; in addition, a rewinding power mechanism (generally, a spiral spring) for rewinding the tape is arranged inside the tape core disc, so that the tape is provided with potential energy in a rewinding direction; the housing is generally integrally molded with a resin material having good moldability, but the housing may be formed with another material such as a metal material.

A brake operating mechanism is provided at a position such as above the front side of the housing so as to be operable from the outside of the housing, and the brake mechanism is connected to the brake operating mechanism via a connecting mechanism for applying a brake to the tape. The connecting mechanism comprises a bracket which can rotate around a fixed shaft, the bracket is connected with a wedge fixing part at the far end deviating from the fixed shaft, the clearance between the ruler core disc and the clamping part is gradually reduced in the rewinding rotating direction of the ruler core disc, the potential energy mechanism is connected with the bracket in a mode of always promoting the wedge fixing part to move towards the small end of the clearance, and the brake operating mechanism is connected with the bracket in a mode of promoting the wedge fixing part to move towards the large end of the clearance. The wedge fixing part is arranged on the bracket which can rotate around the fixed shaft, so that the effective wedge fixing of the wedge fixing part, the ruler core disc and the clamping part can be ensured, and the brake can be released only by small force due to the lever effect, so that the use comfort of the tape measure is improved.

The wedging part can be directly arranged at one end of the transmission arm of the bracket, and in order to ensure that the wedging part can be better wedged between the clamping part and the ruler core disc, the bracket is prevented from being broken due to the fact that the position error bears large stress, so that the transmission arm of the wedging part arranged on the bracket can be made into an arc shape so as to bear the large stress and be not broken. Similarly, a transmission arm end of the bracket can be hinged with the connecting rod, and the wedge fixing part is arranged on the connecting rod, so that the wedge fixing part can move in a small range, and can be adaptively adjusted to be better wedged between the clamping part and the ruler core disc. The wedging is to clamp the component between the core disc and the clamping component.

The wedge-shaped fixing part can be a wedge-shaped block which is made of hard materials and can generate elastic deformation to a certain degree; it is, of course, preferred to make the roller rotatable so that it is in rolling contact when it is in contact with the periphery of the core disc, reducing the resistance to tape pull-out, and when braking, the roller can also stop rotating and wedge between the engaging member and the core disc. To increase the braking speed and effect, the roller surface characteristics may be altered to increase friction, for example the surface may be provided with any one or any combination of protrusions, ridges, grooves or asperities; similarly, the same structure can be arranged on the peripheral surface of the ruler core disc to increase the friction force; in addition, the friction force can be increased by increasing the contact surface, for example, two annular grooves are arranged on the surface of the roller, and the annular grooves are in tabling friction contact with the periphery of the core disc.

The roller comprises a roller shaft and a roller outer sleeve sleeved outside the roller shaft, the roller outer sleeve is made of soft materials or hard materials, however, in view of the higher requirements on the roller structure, an intermediate wear-resistant sleeve is preferably arranged between the roller shaft and the roller outer sleeve, and the intermediate wear-resistant sleeve is made of hard materials or wear-resistant materials, so that the basic shape and hardness of the roller are ensured by the intermediate wear-resistant sleeve, and the roller outer sleeve provides larger surface friction force, thereby ensuring better braking effect.

The clamping component is used as another important component of the wedging brake, and the main effect of the clamping component is to limit the wedging and the rotation of the wedging component at a proper position and in a proper time (such as a roller type wedging component), so the clamping component can be a clamping rib arranged on the shell, and the gap between the clamping rib and the blade core disk is gradually narrowed in the rewinding rotation direction of the blade core disk so as to form a wedging mode of the three components; certainly, the contact surface of the clamping rib and the wedge fixing part is in arc transition, so that unnecessary contact friction between the clamping rib and the wedge fixing part can be avoided when the brake is released, and meanwhile, the stress borne by the clamping rib and the wedge fixing part during the brake can be well dispersed; here, in order to improve the braking speed and effect, the surface characteristics of the roller may also be changed to increase the friction force, for example, the surface is provided with any one of or any combination of protrusions, ribs, grooves or asperities; in addition, the clamping component can also be an elastic sheet with one end arranged on the shell, in the rewinding and rotating direction of the ruler core disc, the gap between the elastic sheet and the ruler core disc gradually narrows, when the wedge fixing component is wedged between the elastic sheet and the ruler core disc, the elastic sheet generates elastic deformation, and generates a larger tendency for preventing the wedge fixing component from being further wedged, and finally the ruler core disc and the wedge fixing component are locked and braked.

The potential energy mechanism is an elastic component such as a torsion spring, a tension spring, a pressure spring or a spring piece, the fixed end of the elastic component is connected with the shell, and the force application end of the elastic component is connected with the bracket; the brake operating mechanism comprises a button arranged on the outer side of the shell and a reset mechanism thereof, the transmission output end of the button is connected with an extension rod, and the extension rod is connected with a transmission arm of the bracket; wherein, the extension rod can be a transmission arm directly pushing or pulling the connecting bracket; the extension rod can also push or pull the transmission arm of the connecting bracket through the middle rod.

Since the technical scheme above is used, the utility model discloses a tape measure can reduce the impact when braking, can reduce the uncomfortable sense when the tape measure brakes to, also can reduce the pull-out resistance when pulling out the tape measure, can pull out the tape measure smoothly, and also can not produce the noise because of the contact slip of braking part and tape measure when pulling out, and, only need exert less power and just can remove the braking, improved the use travelling comfort of tape measure.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is an exploded view of the present invention;

fig. 3 is a schematic diagram of four embodiments of a brake operating mechanism.

Fig. 4 is a schematic view of three embodiments of the connection mechanism.

Figure 5 is a schematic diagram of four embodiments of a potential energy mechanism.

Figure 6 is a schematic view of two forms of wedging elements.

Fig. 7 is a schematic view of various forms of the roller.

Figure 8 is a schematic illustration of the concave-convex surface of the core disc.

Reference numerals:

1. a housing; 2. a circular arc rib; 3. a volute spring; 4. an inner gear plate; 5. a planet carrier; 6. a planetary gear; 7. a button; 8. a return spring; 9. a roller bracket; 10. a roller shaft; 11. a roller; 12. a torsion spring; 13. a roller support shaft; 14. a tape; 15. a ruler core shaft; 16. a ruler core disc.

7a, an extension rod; 7b, the lower end surface of the extension rod; 7c, a rotating shaft; 7d, a hinged shaft; 7e, a draw hook; 7f, a knock pin; 9a, a transmission arm; 9b, a link shaft; 9c, a connecting rod; 11a, an intermediate wear-resistant sleeve; 11b, roller ring grooves; 11c, roller step surfaces; 11d, roller arc surfaces; 11e, roller cylinder; 12a, a spring plate; 12b, a pressure spring; 12c, a tension spring;

Detailed Description

The invention is further illustrated by the following figures and examples:

as shown in fig. 1 and 2, a tape measure with a brake comprises a housing 1, a cavity is provided inside the housing 1, a button 7 and a notch for extending a tape 14 are provided on a side of the housing 1, an arc rib 2 is provided on an inner wall of the housing 1 as a static stress surface (i.e. a clamping component) for automatic locking, a tape core shaft 15 is provided in the cavity of the housing 1, a tape core disc 16 is inserted into the tape core shaft 15, another fixing shaft 13 is provided on an inner wall of the housing 1, the fixing shaft 13 is sleeved with a bracket 9 and a torsion spring 12, two transmission arms are provided on the bracket 9, wherein a roller shaft 10 is provided at a transmission arm end near one side of the tape core disc 16, a roller 11 is sleeved on the roller shaft 10, the tape 14 with a certain length is wound on the tape core disc 16, a positioning column is provided on an inner wall of the button 7, a return spring 8 is sleeved on the positioning column, an extension rod 7a is formed on one side, and a slope surface arranged at the end part of the transmission arm 9a of the bracket 9, wherein the torsion of the torsion spring 12 forces the bracket 9 and the roller 11 to rotate towards the small end of the included angle between the arc rib 2 and the ruler core disc 16.

When the ruler core disc 16 and the ruler tape 14 are not affected by external force, the ruler core disc 16 and the ruler tape 14 are driven to rotate by the stretching force of the scroll spring 3, and the roller 11 is kept to rotate in the locking direction under the torsion action of the bracket 9 and the torsion spring 12, and when the ruler core disc 16 drives the ruler tape 14 to rewind and rotate, the roller 11 is driven to roll in the locking direction, so that the roller 11 is clamped by the arc rib 2 and the included angle of the ruler core disc 16 to generate self-locking, and the ruler core disc 16 cannot rotate randomly; when the ruler core disc 16 is under the action of the traction force of pulling out the ruler belt 14, the ruler core disc 16 rotates towards the locking reverse direction, meanwhile, the ruler core disc 16 drives the bracket 9 and the roller 11 to rotate towards the locking reverse direction, so that the roller 11 is separated from the included angle between the ruler core disc 16 and the arc rib 2, the ruler core disc 16 can rotate randomly, and the unlocking purpose is achieved; or, when the button 7 is pressed down, the force is directly transmitted to the transmission arm 9a of the bracket 9 by the arc surface at the lower end of the extension rod 7a of the button 7, so that the bracket 9 and the roller 11 rotate in the opposite direction of locking (namely the opposite direction of rewinding the ruler core disc), and the roller 11 is separated from the included angle between the ruler core disc 16 and the arc rib 2, thereby achieving the purpose of unlocking.

It should be noted that the above embodiment is only a preferred embodiment of the present invention, and is further illustrative and not limiting for the technical solution of the present invention, and any modification made by adopting the spirit of the present invention is still within the protection scope of the present invention. For example:

as shown in fig. 3, the brake actuator and its connection to the bracket 9 may take many forms, as long as it is operable from outside the housing to urge the wedging member to rotate in the opposite direction to the locking direction. In fig. 3(a), when the button 7 is pressed down, the extension rod 7a moves down, the lower end surface 7b of the extension rod is an inclined surface, and vertical pressure is converted into a rotating force of the bracket 9 by contacting with a round end surface of the transmission arm 9a of the bracket 9, so that the bracket 9 and the roller 11 rotate in the opposite direction of locking, and the roller 11 is separated from an included angle between the core plate 16 and the arc rib 2, thereby unlocking (i.e. braking is released); in fig. 3(b), when the button 7 is pressed down, the extension rod 7a moves down, the lower end surface 7b of the extension rod is an inclined surface, and vertical pressure is converted into a rotating force of the bracket 9 by being wedged with the inclined surface of the transmission arm 9a of the bracket 9, so that the bracket 9 and the roller 11 rotate in the opposite direction of locking, and the roller 11 is separated from the included angle between the core disc 16 and the arc rib 2, thereby realizing unlocking; in fig. 3(c), when the right end of the button 7 is pressed downwards, the extension rod 7a rotates around the rotating shaft 7c, the lower end surface of the extension rod 7a pushes the transmission arm 9a to force the bracket 9 and the roller 11 to rotate in the opposite locking direction, so that the roller 11 is separated from the included angle between the ruler core disc 16 and the arc rib 2 to realize unlocking; in fig. 3(d), when the right end of the button 7 is pressed, the button 7 rotates around the rotating shaft 7c, the extension rod 7a hinged with the left end of the button 7 through the hinge shaft 7d moves upwards, and the draw hook 7e arranged at the lower end of the extension rod 7a pulls the support 9 and the roller 11 to rotate in the opposite locking direction, so that the roller 11 is separated from the included angle between the ruler core disc 16 and the arc rib 2, and unlocking is realized.

As shown in fig. 4, the connecting mechanism can also have various forms, and in fig. 4(a), the bracket is of a whole structure; in fig. 4(b), the bracket is a split link structure, one end of the link 9c is hinged with the bracket 9 through the link shaft 9b, and the roller 11 is arranged at the other end of the link 9 c; in fig. 4(c), the bracket is a split link structure, when the button 7 is pressed down, the extension rod 7a moves down, the top pin 7f pushes the bracket 9 and the roller 11 to rotate in the opposite direction of locking, so that the roller 11 is separated from the included angle between the ruler core disc 16 and the arc rib 2, and unlocking is realized.

As shown in fig. 5, the potential energy mechanism may have various forms as long as it can always impart potential energy to the braking mechanism toward the braking direction. The potential energy mechanism shown in fig. 5(a) is a torsion spring having a different rotation axis from the bracket; the potential energy mechanism shown in fig. 5(b) is a spring plate 12a with one end fixed on the housing; the potential energy mechanism shown in fig. 5(c) is a compression spring 12b disposed between the housing and the bracket; the potential energy mechanism shown in fig. 5(d) is a tension spring 12c disposed between the housing and the bracket.

As shown in fig. 6, the wedging member may also take a variety of forms, shown in fig. 6(a) as a roller and in fig. 6(b) as a wedge.

As shown in fig. 7, the roller shaft 10 may be a whole shaft or two end shafts, and an intermediate wear-resistant sleeve 11a is provided between the roller shaft and the roller outer sleeve. The roller surface shown in fig. 7(c) is provided with an annular groove 11b matched with the periphery of the ruler core disc, the roller surface shown in fig. 7(d) is provided with a step surface 11c, the roller surface shown in fig. 7(e) is an arc surface, and the roller surface shown in fig. 7(f) is a cylindrical surface.

As shown in fig. 8, in order to increase the frictional force, a wavy concave-convex surface is formed on the peripheral surface of the core plate.

Claims

1. The utility model provides a tape measure with stopper, includes casing (1), and casing (1) internal rotation sets up chi core dish (16), and it has chi area (14) to wind on chi core dish (16), chi core dish (16) are connected with rewind power unit and rotation brake, its characterized in that, rotation brake includes at least:

a brake mechanism for applying a brake to the core disc (16);

the braking mechanism comprises a wedge fixing part and a clamping part, wherein the wedge fixing part is wedged and fixed between the ruler core disc (16) and the clamping part in the rewinding rotation direction of the ruler core disc (16) to brake the ruler core disc (16).

2. A brake tape measure according to claim 1, wherein the coupling means comprises a bracket (9) rotatable about the fixed axis (13), the bracket (9) being connected to the keying member at a distal end offset from the fixed axis (13); in the rewinding rotation direction of the ruler core disc (16), the gap between the ruler core disc (16) and the clamping part is gradually reduced, the potential energy mechanism is connected with the bracket (9) in a mode of always promoting the wedge fixing part to move towards the small end of the gap, and the brake operating mechanism is connected with the bracket (9) in a mode of promoting the wedge fixing part to move towards the large end of the gap.

3. A tape measure with brake according to claim 2 wherein the keying member is provided directly at a drive arm end of the bracket (9).

4. A tape measure with brake according to claim 3 wherein the carrier (9) is curved with the drive arm of the wedging member.

5. A tape measure with brake according to claim 2 wherein a drive arm end of the holder (9) is hinged to a link, the link being provided with keying means.

6. A tape measure with brake according to claim 2 wherein the keying element is a rotatably mounted roller (11).

7. A tape measure with brake according to claim 6 wherein the roller (11) is provided with any one or any combination of protrusions, ridges, grooves or ridges on its surface.

8. A tape measure with brake according to claim 6 wherein the peripheral surface of the core disc (16) is provided with any one or any combination of protrusions, ridges, grooves or asperities.

9. A tape measure with brake according to claim 6 wherein the roller (11) is provided with two annular grooves in its surface which engage with the periphery of the core disc (16).

10. The tape measure with the brake as claimed in claim 6, wherein the roller (11) comprises a roller shaft (10) and a roller casing arranged outside the roller shaft (10), and the roller casing is made of soft material or hard material.

11. A tape measure with brake according to claim 10 wherein an intermediate wear sleeve is provided between the roller shaft (10) and the roller sheath, the intermediate wear sleeve being made of a hard or wear resistant material.

12. The tape measure with brake of claim 1, wherein the wedge member is a wedge-shaped block made of a hard material and capable of some degree of elastic deformation.

13. A tape measure with brake according to claim 2 wherein the catch members are catch ribs provided on the housing (1).

14. The brake tape measure of claim 13, wherein the engagement rib is in arc transition with the wedge member.

15. The tape measure with the brake as claimed in claim 13, wherein the contact surface of the snap rib and the wedge member is provided with any one or any combination of protrusions, ribs, grooves or raised grains.

16. The brake-equipped tape measure of claim 2, wherein the catch member is a resilient tab having one end disposed on the housing.

17. The tape measure with the brake as claimed in claim 2, wherein the potential energy mechanism is an elastic member such as a torsion spring, a tension spring, a compression spring or a spring piece, the fixed end of the elastic member is connected with the housing, and the force application end of the elastic member is connected with the bracket (9).

18. A tape measure with a brake according to claim 2 wherein the brake operating means comprises a button (7) and a return means therefor located outside the housing, the drive output of the button (7) being connected to an extension bar which is connected to a drive arm of the bracket (9).

19. A tape measure with a brake according to claim 18 wherein the extension rod directly pushes or pulls the drive arm of the attachment bracket (9).

20. A tape measure with a brake according to claim 18 wherein the extension rod pushes or pulls the actuator arm of the attachment bracket (9) via an intermediate rod.